They don't come onboard when it is delivered, and I just cannot imagine that the Israelis would use these boats, which primary feature is their undetectability (I heard a swedish hydro sucessfully played hide with an american sub for two weeks) and their long sustained submerison for nuclear second strike capabilities. I just can't. That would be too obvious.
By the way, the special thing about the 212 compared to the 214 export version seems to be the non-magnetic hull composed of specifically designed steel, combined with certain installed magnets that nullify differences from the earth's magnetic field. That may be the reason why Israel chose the 212.